ملخص: ResumeObjectifs. - Tenter d’objectiver chez l’enfant la notion de deficit bilateral.Methodes. - La force et l’activite electromyographique des flechisseurs du coude ont ete etudiees chez 10 enfants prepuberes non entraines, lors d’actions isometriques maximales uni et bilaterales.Resultats. - Malgre un deficit bilateral identifie par le calcul de l’index bilateral, sur la base de l’activite electromyographiques de muscles des bras dominants, nos resultats ne montrent aucune modification significative ni des parametres temporels (Root Mean Square : 0,12 V +/- 0,04 vs 0,14 V +/- 0,08), ni des parametres frequentiels (frequences moyennes : 116 Hz +/- 14,1 vs 114,5 Hz +/- 11,2. Frequences medianes : 79,1 Hz +/- 11,8 vs 80,1 Hz +/- 8,3).Conclusion. - Ni une baisse de l’activite musculaire ni un recrutement myotypologique specifique ne semblent pouvoir etre associes au deficit bilateral systematique observe et differentes autres hypotheses explicatives sont envisagees.AbstractObjectives. - To prove the idea of Bilateral Deficit for pre-pubertal children.Methods. - We chose conditions to optimise the Bilateral Deficit probability (arm flexor isometric action of 10 pre-pubertal children). Using a force investigation, we measured a systematic lack of arm flexor force during bilateral contraction. To explain this muscle disability, we investigated the electromyographical signal produced during muscle action of dominant arm.Results. - No muscle activity fall down or typological recruitment changes are evident regard to temporal (RMS: 0.12 +/- 0.04 vs. 0.14 +/- 0.08 V) or spectral (MPF: 116 +/- 14.1 vs. 114.5 +/- 11.2 Hz. MDF: 79.1 +/- 11.8 vs. 80.1 +/- 8.3 Hz) electromyographical (EMG) parameters.Conclusion. - So, to explain the systematic BD, no lack of muscle activity and no recruitment adaptations are evident and we discussed about several other explanations.

لغة: فرنسية